@charset "UTF-8";
:root {
  /* ==========================================
     浅色模式（默认）
     ========================================== */
  /* 浅色模式主题色 */
  --color-primary: #1994f8;
  --color-primary-hover: #64b5f6;
  /* 基础背景色 */
  --bg-white: #ffffff;
  /* 纯白背景（页面最底层） */
  --bg-offwhite: #fafafa;
  /* 浅白背景（比纯白稍灰一点） */
  /*导航栏背景色*/
  --bg-navbar: rgba(255, 255, 255, 0.8);
  --bg-navlinks: rgba(255, 255, 255, 0.9);
  --navbar-scrolled: rgba(255, 255, 255, 0.4);
  --navbar-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  /* 卡片背景 */
  --bg-card: #ffffff;
  /* 卡片默认背景 */
  --bg-card-hover: #f5f5f5;
  /* 卡片悬停背景 */
  /* 文字颜色 */
  --text-primary: #1a1a1a;
  /* 主要文字（标题、正文） */
  --text-secondary: #666666;
  /* 次要文字（说明、辅助信息） */
  --text-tertiary: #999999;
  /*  tertiary文字（占位符、注释） */
  --text-link: #1994f8;
  /* 链接文字 */
  /* 边框与分割线 */
  --border-light: #eeeeee;
  /* 浅色边框（卡片、容器） */
  --border-medium: #e0e0e0;
  /* 中等边框（分隔线） */
  /* ==========================================
     深色模式（通过添加.dark类触发）
     ========================================== */
}

:root.dark {
  /* 深色模式主题色（通过类名切换） */
  --color-primary: #64b5f6;
  --color-primary-hover: #90caf9;
  /* 基础背景色 */
  --bg-white: #121212;
  /* 深色模式下的"白色"背景（页面最底层） */
  --bg-offwhite: #1e1e1e;
  /* 深色模式下的"浅白"背景（稍浅的深色） */
  /*导航栏背景色*/
  --bg-navbar: rgba(18, 18, 18, 0.8);
  --bg-navlinks: rgba(18, 18, 18, 0.9);
  --navbar-scrolled: rgba(18, 18, 18, 0.4);
  --navbar-shadow: 0 2px 10px rgba(255, 255, 255, 0.1);
  /* 卡片背景 */
  --bg-card: #2d2d2d;
  /* 卡片默认背景 */
  --bg-card-hover: #383838;
  /* 卡片悬停背景 */
  /* 文字颜色 */
  --text-primary: #f5f5f5;
  /* 主要文字（标题、正文） */
  --text-secondary: #bbbbbb;
  /* 次要文字（说明、辅助信息） */
  --text-tertiary: #888888;
  /*  tertiary文字（占位符、注释） */
  --text-link: #64b5f6;
  /* 链接文字（主色浅色变体） */
  /* 边框与分割线 */
  --border-light: #333333;
  /* 浅色边框（卡片、容器） */
  --border-medium: #444444;
  /* 中等边框（分隔线） */
}

@font-face {
  font-family: "Playball";
  src: url(../font/Playball-Regular.woff2);
}

* {
  margin: 0;
  padding: 0;
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  caret-color: transparent;
}

* a {
  text-decoration: none;
  color: #000;
}

body {
  background: var(--bg-white);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

/* 光标追踪粒子效果 */
.cursor-particle {
  position: fixed;
  pointer-events: none;
  border-radius: 50%;
  background-color: var(--color-primary);
  mix-blend-mode: multiply;
  z-index: 9999;
}

/* 滚动时元素渐入的效果 */
.fade-in {
  opacity: 0;
  -webkit-transform: translateY(20px);
          transform: translateY(20px);
  -webkit-transition: opacity 0.6s ease-out, -webkit-transform 0.6s ease-out;
  transition: opacity 0.6s ease-out, -webkit-transform 0.6s ease-out;
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
  transition: opacity 0.6s ease-out, transform 0.6s ease-out, -webkit-transform 0.6s ease-out;
  -webkit-transition-delay: 0.2s;
          transition-delay: 0.2s;
  visibility: visible;
  /* 可选：添加动画进行中的标识样式 */
}

.fade-in.visible {
  opacity: 1;
  -webkit-transform: translateY(0);
          transform: translateY(0);
}

.fade-in.animating {
  -webkit-transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
          transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 0.9375rem 5%;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  background: var(--bg-navbar);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  -webkit-box-shadow: var(--navbar-shadow);
          box-shadow: var(--navbar-shadow);
  border-bottom: 5px solid transparent;
  z-index: 1000;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
}

.navbar.scrolled {
  padding: 0.9375rem 5%;
  background: var(--navbar-scrolled);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.navbar .logo {
  padding-right: 0.5rem;
  line-height: 1.6;
  font-family: Playball;
  font-size: 1.9531rem;
  font-weight: bold;
  text-decoration: none;
  background: -webkit-gradient(linear, left top, right top, from(#833ab4), color-stop(33.3%, #fd1d1d), color-stop(66.6%, #fcb045), to(#833ab4));
  background: linear-gradient(90deg, #833ab4 0%, #fd1d1d 33.3%, #fcb045 66.6%, #833ab4 100%);
  background-clip: text;
  -webkit-background-clip: text;
  /*截取背景区域为文字*/
  color: transparent;
  background-size: 300% 100%;
  /*扩大背景区域*/
  -webkit-animation: text 5s infinite linear;
          animation: text 5s infinite linear;
}

@-webkit-keyframes text {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: -150% 0;
  }
}

@keyframes text {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: -150% 0;
  }
}

.nav-links {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  gap: 1.5rem;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
}

.nav-links a {
  color: var(--dark);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  padding: 0.25rem 0;
  -webkit-transition: all 0.3s ease;
  transition: all 0.3s ease;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: -webkit-gradient(linear, left top, right top, from(var(--color-primary)), to(var(--color-primary-hover)));
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-hover));
  -webkit-transform: translateX(-50%);
          transform: translateX(-50%);
  -webkit-transition: width 0.3s ease;
  transition: width 0.3s ease;
}

.nav-links a:hover {
  color: var(--color-primary);
  -webkit-transform: translateY(-2px);
          transform: translateY(-2px);
  text-shadow: 0 2px 8px rgba(var(--color-primary), 0.3);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-links a:active {
  -webkit-transform: translateY(0);
          transform: translateY(0);
  -webkit-transition-duration: 0.1s;
          transition-duration: 0.1s;
}

/* 移动端切换图标 */
.menu-toggle {
  display: none;
  cursor: pointer;
  font-size: 1.5rem;
}

button:hover {
  background-color: var(--border-medium);
}

.theme-toggle {
  font-size: 1.2rem;
  color: var(--color-primary);
  background: var(--border-light);
  border: 1px solid var(--border);
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
}

.theme-toggle:hover {
  background-color: var(--border-medium);
}

/* 英雄区域 */
.hero {
  height: 100vh;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--bg-offwhite) 0%, #c3cfe2 100%);
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url("https://images.unsplash.com/photo-1497366754035-f200968a6e72?ixlib=rb-4.0.3&auto=format&fit=crop&w=1350&q=80") center/cover;
  opacity: 0.2;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding: 0 20px;
}

.avatar {
  width: 10rem;
  height: 10rem;
  margin: 0 auto;
}

/* 头像 */
.avatar img {
  width: 100%;
  height: 100%;
  -o-object-fit: cover;
     object-fit: cover;
  border: 4px solid #fff;
  border-radius: 9999px;
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 20px;
  color: var(--color-primary);
}

.hero p {
  font-size: 1.2rem;
  margin-bottom: 30px;
  color: var(--dark);
}

.btn {
  display: inline-block;
  padding: 12px 30px;
  background: var(--color-primary);
  color: white;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 500;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  border: 2px solid var(--color-primary);
}

.btn:hover {
  background: transparent;
  color: var(--color-primary);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  margin-left: 15px;
}

.btn-outline:hover {
  background: var(--color-primary);
  color: white;
}

.start {
  position: absolute;
  bottom: 2.5rem;
  left: 0;
  right: 0;
  text-align: center;
}

.start a {
  display: inline-block;
  color: rgba(var(--bg-white), 1);
  -webkit-animation: bounce 1s infinite;
          animation: bounce 1s infinite;
}

.start i {
  font-size: 1.5rem;
  line-height: 2rem;
}

@-webkit-keyframes bounce {
  0%,
  100% {
    -webkit-transform: translateY(-25%);
            transform: translateY(-25%);
    -webkit-animation-timing-function: cubic-bezier(0.8, 0, 1, 1);
            animation-timing-function: cubic-bezier(0.8, 0, 1, 1);
  }
  50% {
    -webkit-transform: none;
            transform: none;
    -webkit-animation-timing-function: cubic-bezier(0, 0, 0.2, 1);
            animation-timing-function: cubic-bezier(0, 0, 0.2, 1);
  }
}

@keyframes bounce {
  0%,
  100% {
    -webkit-transform: translateY(-25%);
            transform: translateY(-25%);
    -webkit-animation-timing-function: cubic-bezier(0.8, 0, 1, 1);
            animation-timing-function: cubic-bezier(0.8, 0, 1, 1);
  }
  50% {
    -webkit-transform: none;
            transform: none;
    -webkit-animation-timing-function: cubic-bezier(0, 0, 0.2, 1);
            animation-timing-function: cubic-bezier(0, 0, 0.2, 1);
  }
}

/* ------------------------------------------- */
section {
  padding-top: 5rem;
  padding-bottom: 5rem;
}

.section-title {
  text-align: center;
  margin-bottom: 60px;
  font-size: 2.5rem;
  color: var(--color-primary);
}

.section-container {
  max-width: 1200px;
  margin: 0 auto;
}

.section-container-full {
  max-width: 100%;
  margin: 0 auto;
}

.card:hover {
  cursor: pointer;
  -webkit-transform: translateY(-5px);
          transform: translateY(-5px);
  -webkit-box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
          box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

/* ------------------------------------------- */
/* <!-- 技能雷达图 --> */
/* 技能部分 */
#skills {
  padding: 100px 5%;
  background: var(--bg-offwhite);
}

#skills .skills-content {
  display: -ms-grid;
  display: grid;
  -ms-grid-columns: (minmax(300px, 1fr))[auto-fit];
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

#skills .skills-content .chart-container {
  color: var(--text-tertiary);
}

#skills .skills-content .grid {
  display: -ms-grid;
  display: grid;
  -ms-grid-columns: (minmax(0, 1fr))[2];
      grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
}

#skills .skills-content .grid .card {
  background: var(--bg-card);
  padding: 30px;
  border-radius: 10px;
  -webkit-box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
          box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  -webkit-transition: -webkit-transform 0.3s, -webkit-box-shadow 0.3s;
  transition: -webkit-transform 0.3s, -webkit-box-shadow 0.3s;
  transition: transform 0.3s, box-shadow 0.3s;
  transition: transform 0.3s, box-shadow 0.3s, -webkit-transform 0.3s, -webkit-box-shadow 0.3s;
}

#skills .skills-content .grid .card .skill-icon {
  font-size: 2.5rem;
  color: var(--color-primary);
  margin-bottom: 20px;
}

#skills .skills-content .grid .card h3 {
  font-size: 1.5rem;
  margin-bottom: 15px;
}

#skills .skills-content .grid .card p {
  color: var(--text-secondary);
}

/* 相册 */
#album {
  display: block;
  /* height: 500px; */
  background-color: var(--bg-white);
}

#album .album-content {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  /* 不换行 */
  -ms-flex-wrap: nowrap;
      flex-wrap: nowrap;
  /* border: 1px solid green; */
}

#album .album-content .album-col {
  padding: 0 12px;
  -webkit-box-flex: 1;
      -ms-flex: 1;
          flex: 1;
  /* min-width: 250px; */
  /* border: 1px solid red; */
}

#album .album-content .album-col a {
  display: block;
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
  color: inherit;
  /* margin-bottom: 24px; */
  margin: 12px 0;
}

#album .album-content .album-col a img {
  width: 100%;
  /* width: 290px; */
  border-radius: 12px;
  -webkit-transition: all 0.3s ease-in-out;
  transition: all 0.3s ease-in-out;
  /* 动画持续时间 */
}

#album .album-content .album-col a:hover img {
  -webkit-transform: scale(1.06);
          transform: scale(1.06);
}

/* 时间线历程 */
#timeline {
  padding: 100px 5%;
  background: var(--bg-offwhite);
}

#timeline .timeline-items {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  margin-bottom: 3rem;
}

#timeline .timeline-items .item-line {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  margin-right: 1.5rem;
}

#timeline .timeline-items .item-line .timeline-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--color-primary);
  border: 3px solid var(--bg-white);
}

#timeline .timeline-items .item-line .timeline-line {
  -webkit-box-flex: 1;
      -ms-flex-positive: 1;
          flex-grow: 1;
  width: 1px;
  background-color: var(--border-medium);
}

#timeline .timeline-items .timeline-items-content {
  padding-bottom: 2rem;
}

#timeline .timeline-items .timeline-items-content h3 {
  font-weight: 600;
  font-size: 1.5rem;
  line-height: 2rem;
  margin-bottom: 0.5rem;
}

#timeline .timeline-items .timeline-items-content .timeline-p1 {
  color: #6b7280;
  margin-bottom: 0.5rem;
}

#timeline .timeline-items .timeline-items-content .timeline-p2 {
  color: #4b5563;
}

/* 个人兴趣 */
#hobbies {
  background-color: var(--bg-white);
}

#hobbies .hobbies-content {
  display: -ms-grid;
  display: grid;
  -ms-grid-columns: (minmax(0, 1fr))[auto-fit];
      grid-template-columns: repeat(auto-fit, minmax(0, 1fr));
  -ms-grid-columns: (minmax(0, 1fr))[4];
      grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 2rem;
  /* max-width: 56rem; */
  visibility: visible;
}

#hobbies .hobbies-content .card {
  text-align: center;
  padding: 1.5rem;
  border-radius: 0.75rem;
  -webkit-transition: all 0.3s ease;
  transition: all 0.3s ease;
  background-color: var(--bg-white);
}

#hobbies .hobbies-content .card i {
  font-size: 2.25rem;
  line-height: 2.5rem;
  margin-bottom: 1rem;
  color: var(--color-primary);
}

#hobbies .hobbies-content .card h3 {
  font-weight: 600;
  font-size: 1.25rem;
  line-height: 1.75rem;
  margin-bottom: 0.5rem;
}

/************ 联系部分 ************/
#contact {
  padding: 100px 5%;
  background: #e0e5ec;
  text-align: center;
}

#contact .contact-content {
  display: -ms-grid;
  display: grid;
  -ms-grid-columns: (minmax(300px, 1fr))[auto-fit];
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 3rem;
}

#contact .contact-content .contact-card {
  background: #e0e5ec;
  border-radius: 1.25rem;
  padding: 1.875rem;
  -webkit-box-shadow: 8px 8px 15px rgba(163, 177, 198, 0.6), -8px -8px 15px rgba(255, 255, 255, 0.5);
          box-shadow: 8px 8px 15px rgba(163, 177, 198, 0.6), -8px -8px 15px rgba(255, 255, 255, 0.5);
  -webkit-transition: all 0.3s ease;
  transition: all 0.3s ease;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
}

#contact .contact-content .contact-card:hover {
  -webkit-transform: translateY(-5px);
          transform: translateY(-5px);
  -webkit-box-shadow: 12px 12px 20px rgba(163, 177, 198, 0.6), -12px -12px 20px rgba(255, 255, 255, 0.5);
          box-shadow: 12px 12px 20px rgba(163, 177, 198, 0.6), -12px -12px 20px rgba(255, 255, 255, 0.5);
}

#contact .contact-content .contact-card:active {
  -webkit-box-shadow: inset 5px 5px 10px rgba(163, 177, 198, 0.6), inset -5px -5px 10px rgba(255, 255, 255, 0.5);
          box-shadow: inset 5px 5px 10px rgba(163, 177, 198, 0.6), inset -5px -5px 10px rgba(255, 255, 255, 0.5);
}

#contact .contact-content .contact-card .contact-icon {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  margin-bottom: 20px;
  font-size: 1.8rem;
  color: white;
  -webkit-box-shadow: 5px 5px 10px rgba(163, 177, 198, 0.6), -5px -5px 10px rgba(255, 255, 255, 0.5);
          box-shadow: 5px 5px 10px rgba(163, 177, 198, 0.6), -5px -5px 10px rgba(255, 255, 255, 0.5);
}

#contact .contact-content .contact-card .contact-icon.email {
  background: linear-gradient(135deg, #4a6fa5 0%, #6c5ce7 100%);
}

#contact .contact-content .contact-card .contact-icon.github {
  background: linear-gradient(135deg, #333 0%, #6e5494 100%);
}

#contact .contact-content .contact-card .contact-icon.douyin {
  background: linear-gradient(135deg, #000 0%, #333 100%);
}

#contact .contact-content .contact-card .contact-icon.instagram {
  background: radial-gradient(circle at 30% 107%, #fdf497 0%, #fdf497 5%, #fd5949 45%, #d6249f 60%, #285aeb 90%);
}

#contact .contact-content .contact-card .contact-icon.facebook {
  background: linear-gradient(135deg, #4d90fe 0%, #0866ff 50%, #0047b3 100%);
}

#contact .contact-content .contact-card .contact-icon.csdn {
  background: linear-gradient(135deg, #ff7d00 0%, #ff5a00 100%);
}

#contact .contact-content .contact-card .contact-name {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: #4a6fa5;
}

#contact .contact-content .contact-card .contact-info {
  color: #5e6e8a;
  margin-bottom: 15px;
}

#contact .contact-content .contact-card .contact-link {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  background: #e0e5ec;
  color: #4a6fa5;
  border-radius: 3rem;
  text-decoration: none;
  font-weight: 500;
  margin-top: auto;
  -webkit-box-shadow: 3px 3px 6px rgba(163, 177, 198, 0.6), -3px -3px 6px rgba(255, 255, 255, 0.5);
          box-shadow: 3px 3px 6px rgba(163, 177, 198, 0.6), -3px -3px 6px rgba(255, 255, 255, 0.5);
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
}

#contact .contact-content .contact-card .contact-link:hover {
  -webkit-box-shadow: inset 3px 3px 6px rgba(163, 177, 198, 0.6), inset -3px -3px 6px rgba(255, 255, 255, 0.5);
          box-shadow: inset 3px 3px 6px rgba(163, 177, 198, 0.6), inset -3px -3px 6px rgba(255, 255, 255, 0.5);
  color: #ff7e5f;
}

/* 社交图标样式 */
/* 页脚 */
#footer {
  background: var(--dark);
  color: #4b5563;
  padding: 2rem 0;
}

#footer .footer-content {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: horizontal;
  -webkit-box-direction: normal;
      -ms-flex-direction: row;
          flex-direction: row;
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
}

#footer .footer-content .footer-left {
  text-align: left;
}

#footer .footer-content .footer-left .copyright {
  color: #4b5563;
}

#footer .footer-content .donate {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  gap: 2rem;
}

#footer .footer-content .donate .social-icon {
  font-size: 1.5rem;
  width: 3rem;
  height: 3rem;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  border-radius: 50%;
  -webkit-transition: all 0.3s ease;
  transition: all 0.3s ease;
  cursor: pointer;
  color: white;
  position: relative;
  background-color: var(--border-medium);
  will-change: transform, box-shadow;
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
}

#footer .footer-content .donate .social-icon .qr-popup {
  position: absolute;
  bottom: 100%;
  left: 50%;
  -webkit-transform: translateX(-50%) translateY(10px);
          transform: translateX(-50%) translateY(10px);
  margin-bottom: 15px;
  width: 9.375rem;
  height: 12.5rem;
  background: white;
  border-radius: 10px;
  -webkit-box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
          box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  padding: 0.625rem;
  opacity: 0;
  visibility: hidden;
  -webkit-transition: all 0.3s ease;
  transition: all 0.3s ease;
}

#footer .footer-content .donate .social-icon .qr-popup::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  -webkit-transform: translateX(-50%);
          transform: translateX(-50%);
  border-width: 10px;
  border-style: solid;
  border-color: white transparent transparent transparent;
}

#footer .footer-content .donate .social-icon .qr-popup img {
  width: 100%;
  height: 100%;
  -o-object-fit: contain;
     object-fit: contain;
}

#footer .footer-content .donate .social-icon:hover {
  -webkit-transform: scale(1.1);
          transform: scale(1.1);
  -webkit-box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
          box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

#footer .footer-content .donate .social-icon:hover .qr-popup {
  opacity: 1;
  visibility: visible;
  -webkit-transform: translateX(-50%) translateY(0);
          transform: translateX(-50%) translateY(0);
}

#footer .footer-content .donate .social-icon:hover.wechat {
  background: linear-gradient(135deg, #07c160 0%, #09b557 100%);
}

#footer .footer-content .donate .social-icon:hover.alipay {
  background: linear-gradient(135deg, #1677ff 0%, #4096ff 100%);
}

#footer .footer-content .footer-right {
  text-align: right;
}

#footer .footer-content .footer-right .count {
  color: #6b7280;
}

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--bg-white);
  border: none;
  cursor: pointer;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  font-size: 1.5rem;
  -webkit-box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
          box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  -webkit-transition: all 0.3s ease;
  transition: all 0.3s ease;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  -webkit-transform: translateY(20px);
          transform: translateY(20px);
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
  -webkit-transform: translateY(0);
          transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-primary-hover);
  -webkit-transform: translateY(-5px);
          transform: translateY(-5px);
  -webkit-box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
          box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.back-to-top:active {
  -webkit-transform: translateY(0);
          transform: translateY(0);
}

/* 汉堡菜单按钮（移动端） */
.menu-toggle {
  display: none;
  cursor: pointer;
  font-size: 1.5rem;
}

/* 手机端（通常 < 768px）*/
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  .nav-links {
    position: fixed;
    top: 5rem;
    left: 0;
    width: 100%;
    padding: 1rem 2rem;
    gap: 0rem;
    border-radius: 0 0 2rem 2rem;
    -webkit-box-shadow: 0 4px 12px rgba(var(--text-primary), 0.3);
            box-shadow: 0 4px 12px rgba(var(--text-primary), 0.3);
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
        -ms-flex-direction: column;
            flex-direction: column;
    -webkit-box-align: center;
        -ms-flex-align: center;
            align-items: center;
    -webkit-box-pack: center;
        -ms-flex-pack: center;
            justify-content: center;
    -webkit-transform-origin: top;
            transform-origin: top;
    -webkit-transform: scaleY(0);
            transform: scaleY(0);
    opacity: 0;
    -webkit-transition: all 0.5s ease;
    transition: all 0.5s ease;
    z-index: 99;
    /* 确保在其他内容上方 */
  }
  /* 下拉列表展开状态 */
  .nav-links.active {
    -webkit-transform: scaleY(1);
            transform: scaleY(1);
    opacity: 1;
    background: var(--bg-navlinks);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    z-index: 100001;
    /* 确保在其他内容上方 */
  }
  .nav-links a {
    text-align: center;
    display: block;
    width: 100%;
    padding: 0.5rem;
    border-bottom: 1px solid var(--text-tertiary);
  }
  .nav-links button {
    margin-top: 1rem;
  }
  .hero h1 {
    font-size: 2rem;
  }
  .btn-outline {
    margin-left: 0;
  }
  /* 个人兴趣 */
  #hobbies .hobbies-content {
    -ms-grid-columns: (minmax(0, 1fr))[2];
        grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .contact-content {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: (minmax(0, 1fr))[2];
        grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
  }
  .contact-link {
    font-size: 0.75rem;
  }
  #footer {
    text-align: center;
  }
  #footer .footer-content {
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
        -ms-flex-direction: column;
            flex-direction: column;
    gap: 1.5rem;
  }
  #footer .footer-content .footer-left {
    text-align: center;
  }
  #footer .footer-content .donate {
    -webkit-box-ordinal-group: 0;
        -ms-flex-order: -1;
            order: -1;
  }
  #footer .footer-content .footer-right {
    text-align: center;
    -webkit-box-ordinal-group: 2;
        -ms-flex-order: 1;
            order: 1;
  }
  .back-to-top {
    bottom: 1.5rem;
    right: 1.5rem;
    width: 45px;
    height: 45px;
    font-size: 1.2rem;
  }
}